The setup in this case is a flat surface. It does not require the import of a dem file, since all height values are set to 0.
[[File:setup_case4_ukbm.png|thumb|right|x300px|Figure 1. Setup of case 4 used by the {{software}}]]
Other stats:
* Flat surface
* The grid cell size: 5 m.
* Grid-cell size (m): 5
* The area size: 1010x2010, which includes a border of 5 meters and the required domain of 1000m, x 2000m.
* Area size (m): 1,010 x 2,010 (required domain of 1,000 x 2,000 + 5-m border)
* The measurement points have been put on the correct positions, see the image below.
* The measurement points were positioned correctly (see Fig. 1)
[[File:setup_case4_ukbm.png|thumb|left|x300px|Setup of case 4 used by the {{software}}]]<br style="clear:both">
In order to regulate the boundary discharge according the hydrograph (Fig. 2), 2 inlets were implemented. Both inlets occupied one grid cell, one of these located above and the other below the green center line (Fig. 3). The inlets were configured as follows:
In order to regulate the water level according to the water level graph, we used the following setup: Only two inlets are used. These are put on the cells above and below the center line indicated by the green line. Each inlet had its own grid cell. The inlets were configured as:
* External area (m<sup>2</sup>): 1,000,000,000
* External area (m2): 1 000 000 000;
* Water level (m): 1
* Water level (m): 1;
* Threshold (m): none
* Threshold (m): none;
* Inlet Q (m):
* Inlet Q (m):
[[File:inletq_case4_ukbm.png|thumb|left|x300px|Inlet influx graph used by the {{software}}]]<br style="clear:both">
[[File:inletq_case4_ukbm.png|thumb|left|x300px|Figure 2. Inlet influx graph used by the {{software}}]]<br style="clear:both">
This page reports on the performance of the Tygron Platform's Water Module by means of the UK EA Benchmark Test 4 – Speed of flood propagation over an extended floodplain.
The objective of this test is to assess the package’s ability to simulate the celerity of propagation of a flood wave and predict transient velocities and depths at the leading edge of the advancing flood front. It is relevant to fluvial and coastal inundation resulting from breached embankments.[1]
Description
This test is designed to simulate the rate of flood wave propagation over a 1,000 x 2,000 m floodplain following a defence failure (Fig. (a)). The floodplain surface is horizontal, at datum (= 0 m). One inflow boundary condition will be used, simulating the failure of an embankment by breaching or overtopping, with a peak flow of 20 m3/s and time base of ~6 h. The boundary condition is applied along a 20-m line in the middle of the western side of the floodplain.[1]
Figure (a): Modelled domain and the locations of the 20-m line of inflow, 6 output points, and the aimed for 0.1-m and 0.2-m contour lines at t = 1 h (dashed) and t = 3 h (solid), respectively.Animation of the test result for case 4, generated by the Tygron Platform. Map dimensions = 1,000 x 2,000 m. Grid-cell size = 5 m.Figure (b): Hydrograph applied as inflow boundary condition.
Boundary and initial condition
Inflow boundary condition as shown in Fig. (b)
All other boundaries are closed
Initial condition: dry bed
Parameter values
Manning’s n: 0.05 (uniform)
Model grid resolution (m): 5 (or ~80,000 nodes in the area modelled)
Simulated time (h): 5
Required output
Point ID
X
Y
1
50
1,000
2
100
1,000
3
200
1,000
4
300
1,000
5
300
1,000
6
300
1,300
Software package used: version and numerical scheme
Specification of hardware used to undertake the simulation: processor type and speed, RAM
Minimum recommended hardware specification for a simulation of this type
Time increment used, grid resolution (or number of nodes in area modelled) and total simulation time to specified time of end
Raster grids (or TIN) at the model resolution consisting of:
Depths and at t = 30 min, 1 h, 2 h, 3 h and 4 h
Velocities (scalar) at t = 30 min, 1 h, 2 h, 3 h and 4 h
Plots of velocity and water elevation v. time (suggested output frequency: 20 s) at the 6 locations represented in Fig. (a) and provided as part of dataset
Dataset content
Upstream boundary condition table (inflow v. time). Filename: Test4BC.csv
Location of output points. Filename: Test4Output.csv
The model geometry is as specified in Section 2. No DEM is provided, as the surface elevation is level at datum (= 0 m).[1]
Technical setup
Figure 1. Setup of case 4 used by the Tygron Platform
Flat surface
Grid-cell size (m): 5
Area size (m): 1,010 x 2,010 (required domain of 1,000 x 2,000 + 5-m border)
The measurement points were positioned correctly (see Fig. 1)
In order to regulate the boundary discharge according the hydrograph (Fig. 2), 2 inlets were implemented. Both inlets occupied one grid cell, one of these located above and the other below the green center line (Fig. 3). The inlets were configured as follows:
External area (m2): 1,000,000,000
Water level (m): 1
Threshold (m): none
Inlet Q (m):
Figure 2. Inlet influx graph used by the Tygron Platform
